ulva green algae thicket oxygenate, black sea brackish biotope clay bottom, laminar flow, vegetation in muddy nutrient rich water

enteromorpha intestinales cladophora sericea albida ulva intestinalis rigida ceramium aquatic coast shallow rockpool underwater landscape environment flora marine rock salt saltwater ocean habitat seaweed benthos pebble submerged summertime travel wildlife swim exploration space shell gravel turquoise vegetation snorkel macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication ecology diving odesa ukraine aquadesign ecosystem pelagic background green algae thicket oxygenate black sea brackish biotope clay bottom laminar flow muddy nutrient rich water breaking wave air bubble reflection zone